Allow the cast tray to function as expected when the installed extension is missing API methods.

BUG=489445

Review URL: https://codereview.chromium.org/1145833003

Cr-Commit-Position: refs/heads/master@{#330663}

ash/ash_strings.grd

@@ -278,6 +278,12 @@ Press Ctrl+Alt+Z to disable.
       <message name="IDS_ASH_STATUS_TRAY_CAST_STOP" desc="The label used in the tray popup to stop casting.">
         Stop
       </message>
+      <message name="IDS_ASH_STATUS_TRAY_CAST_UNKNOWN_CAST_TYPE" desc="The label used when we have detected we are casting but do not know if we are casting a tab or the desktop.">
+        Casting
+      </message>
+      <message name="IDS_ASH_STATUS_TRAY_CAST_UNKNOWN_RECEIVER" desc="The label used when we have detected we are casting but do not know the name of the receiver.">
+        Unknown receiver
+      </message>
 
       <message name="IDS_ASH_STATUS_TRAY_BLUETOOTH" desc="The label used as the header in the bluetooth popup.">
         Bluetooth

ash/cast_config_delegate.h

@@ -83,13 +83,8 @@ class CastConfigDelegate {
   // Cast to a receiver specified by |receiver_id|.
   virtual void CastToReceiver(const std::string& receiver_id) = 0;
 
-  // Stop ongoing cast. The |activity_id| is the unique identifier associated
-  // with the ongoing cast. Each receiver has only one possible activity
-  // associated with it. The |activity_id| is available by invoking
-  // GetReceiversAndActivities(); if the receiver is currently casting, then the
-  // associated activity data will have an id. This id can be used to stop the
-  // cast in this method.
-  virtual void StopCasting(const std::string& activity_id) = 0;
+  // Stop an ongoing cast.
+  virtual void StopCasting() = 0;
 
   // Opens Options page for cast.
   virtual void LaunchCastOptions() = 0;

ash/system/cast/tray_cast.cc

@@ -38,28 +38,6 @@ namespace ash {
 
 namespace {
 const int kStopButtonRightPadding = 18;
-
-// Callback helper for StopCast().
-void StopCastCallback(
-    CastConfigDelegate* cast_config,
-    const CastConfigDelegate::ReceiversAndActivites& receivers_activities) {
-  for (auto& item : receivers_activities) {
-    CastConfigDelegate::Activity activity = item.second.activity;
-    if (activity.allow_stop && activity.id.empty() == false)
-      cast_config->StopCasting(activity.id);
-  }
-}
-
-// Stops currently casting device.
-void StopCast() {
-  CastConfigDelegate* cast_config =
-      Shell::GetInstance()->system_tray_delegate()->GetCastConfigDelegate();
-  if (cast_config && cast_config->HasCastExtension()) {
-    cast_config->GetReceiversAndActivities(
-        base::Bind(&StopCastCallback, cast_config));
-  }
-}
-
 }  // namespace
 
 namespace tray {
@@ -182,12 +160,16 @@ CastCastView::CastCastView(CastConfigDelegate* cast_config_delegate)
   title_ = new views::Label;
   title_->SetHorizontalAlignment(gfx::ALIGN_LEFT);
   title_->SetFontList(bundle.GetFontList(ui::ResourceBundle::BoldFont));
+  title_->SetText(
+      bundle.GetLocalizedString(IDS_ASH_STATUS_TRAY_CAST_UNKNOWN_CAST_TYPE));
   label_container_->AddChildView(title_);
 
   details_ = new views::Label;
   details_->SetHorizontalAlignment(gfx::ALIGN_LEFT);
   details_->SetMultiLine(false);
   details_->SetEnabledColor(kHeaderTextColorNormal);
+  details_->SetText(
+      bundle.GetLocalizedString(IDS_ASH_STATUS_TRAY_CAST_UNKNOWN_RECEIVER));
   label_container_->AddChildView(details_);
 
   AddChildView(label_container_);
@@ -270,7 +252,7 @@ void CastCastView::UpdateLabelCallback(
 void CastCastView::ButtonPressed(views::Button* sender,
                                  const ui::Event& event) {
   DCHECK(sender == stop_button_);
-  StopCast();
+  cast_config_delegate_->StopCasting();
 }
 
 // This view by itself does very little. It acts as a front-end for managing

chrome/browser/ui/ash/cast_config_delegate_chromeos.cc

@@ -138,8 +138,14 @@ void CastConfigDelegateChromeos::CastToReceiver(
                     "');");
 }
 
-void CastConfigDelegateChromeos::StopCasting(const std::string& activity_id) {
+void CastConfigDelegateChromeos::StopCasting() {
   ExecuteJavaScript("backgroundSetup.stopCastMirroring('user-stop');");
+
+  // TODO(jdufault): Remove this after stopCastMirroring is properly exported.
+  // The current beta/release versions of the cast extension do not export
+  // stopCastMirroring, so we will also try to call the minified version.
+  // See crbug.com/489929.
+  ExecuteJavaScript("backgroundSetup.Qu('user-stop');");
 }
 
 void CastConfigDelegateChromeos::LaunchCastOptions() {

chrome/browser/ui/ash/cast_config_delegate_chromeos.h

@@ -27,7 +27,7 @@ class CastConfigDelegateChromeos : public ash::CastConfigDelegate {
   void GetReceiversAndActivities(
       const ReceiversAndActivitesCallback& callback) override;
   void CastToReceiver(const std::string& receiver_id) override;
-  void StopCasting(const std::string& activity_id) override;
+  void StopCasting() override;
   void LaunchCastOptions() override;
 
   DISALLOW_COPY_AND_ASSIGN(CastConfigDelegateChromeos);